No. It was me, relating stuff I learned while taking some post bachelors sociology/psychology classes.

Mass murder kills a bunch of people. Maybe one at a time, but still offs a lot of folks. Sitting on a clock tower on a TX campus shooting everyone walking by: that is a mass murderer. Jack the Ripper is the exemplar of a serial killer.

A serial killer virtually always kills one at a time, and there is always a sexual component to the killing: rape, slicing off naughty bits, or stabbing smilies/hearts in the uterus. That sort of thing. Police and shrinks don't reveal too much about just *what* makes a serial killer's trademark "technique." Many times it is just too sickening to realize that humans can be *that* fucked in the head.

Maybe MrSerialKiller#00000327-0000-0000-C000-000000000046 likes to kill brunette prostitutes with a particular type of noose/ligature/IUnknown. Telling the public about it leads to copycat crimes, or sometimes, to someone else duplicating the crimes to try to provide an alibi for the person arrested/convicted of doing the misdeeds. That desire to cut down on copycats is why there are almost no references in the media to drive-by shootings, or to roadside snipers. You have to hit/kill more than about 50 people to start getting in the news for a roadside sniper.